中小学教育资源及组卷应用平台
外研版八年级上册Module8 when和while过去进行时专项练习
一、用所给词的正确形式填空
1．It (get) dark when we (arrive) at the village.
2．The children (swim) when they (hear) a big noise outside.
Later they knew that a huge tree (fall) down because of the strong wind at that time.
3．— the students (draw) when the teacher came in
—No , they .
4．Daniel (write) an e-mail to his friend when the doorbell rang.
5．When the lady (arrive), the man (lie) at the roadside unconscious.
She called the ambulance right away and waited till the medical team came for rescue.
6．While my friend and I (wait) at the gate, a stranger (hurry) to us for help.
7．—What made Ann’s mother so angry just now
—Ann (not listen) when her mom was trying to explain why they couldn’t go to the new theme park.
8．He (tie) a sheep to a tree when I saw him.
9．Tom said he （drive）home when suddenly the man rushed out.
10．While I (introduce) myself to the new class, Ms. Green’s sweet smile gave me much confidence.
二、按要求改写下列句子
11．When the accident happened, I was walking along the street. (就划线部分提问)
you when the accident happened
12．I was sleeping while Linda was helping her mother. (对划线部分提问)
you doing while Linda was helping her mother
13．Mario was taking a shower when Jimmy called him last night. (对划线部分提问)
was Mario when Jimmy called him last night
14．I was waiting for the bus when the rainstorm came. (改为否定句)
I waiting for the bus when the rainstorm came.
15．I was watching TV when Mother came in. (用while替换)
I was TV, Mother came in.
16．I was watching the birds when the rain started.（改写成一般疑问句）
you the birds when the rain started
17．I was walking in the street. I found a wallet on the ground. (合并为一句)
I was walking in the street I a wallet on the ground.
18．While we were walking on the road, it began to rain. (用when改写句子)
We were walking on the road began to rain.
19．I was singing at that moment when everybody came in. (改成一般疑问句)
you at that moment when everybody came in
20．While I was having a shower, you called me. （用when替换）
I a shower you called me.
三、单项选择
21．When I walked past the playground, Class 1 ________. But later, students told me that they lost ________ only 2 points.
A．had won; at B．were winning; by C．had won; by D．were winning; at
22．When the telephone rang I ________ cookies for my family.
A．make B．will make C．was making D．made
23．Jack ________ the meal for his family when someone knocked at the door.
A．cooks B．will cook C．is cooking D．was cooking
24．My wife and I ________ a horror movie when suddenly someone knocked at the door.
A．are watching B．were watching C．watched D．watch
25．While my mother ________ some shopping yesterday, she happened to meet an old friend.
A．was doing B．did C．has done D．does
26．I ________ about my sister when my phone rang. It was her!
A．am thinking B．thought C．will think D．was thinking
27．She ________ the rubbish when it began to snow.
A．throws B．is throwing C．will throw D．was throwing
28．I ________ a poster in my study when you called me.
A．make B．made C．am making D．was making
29．—Where is Peter
—I’m not sure. He ________ the piano in the music room when I saw him just now.
A．plays B．will play C．is playing D．was playing
30．What book ________ you ________ when you ________ me at four o’clock yesterday afternoon
A．did; read; was seeing B．did; read; saw
C．were; reading; saw D．were; reading; was seeing
31．—________ did the rainstorm come, Mr Liu
—While we ________ a chemistry lesson yesterday afternoon.
A．When; have B．When; were having
C．While; are having D．While; have
32．We ________ on Nanjing Road when it suddenly started to rain last Saturday.
A．walked B．were walking C．are walking D．was walking
33．While I ________ a short video in my room, my dog ran into the room.
A．recorded B．is recording C．was recording D．recording
34．—Yesterday afternoon, when I _______ a basketball match at the playground, I ______Peter!
—Really
A．was seeing; watched B．was watching; was seeing
C．watched; saw D．was watching; saw
35．My mother ________ while my father ________ a newspaper last night.
A．was cooking；read B．cooked；read
C．was cooking；was reading D．cooked；was reading
36．My mother ________ some washing when the telephone rang.
A．does B．was doing C．is doing D．did
37．—I heard you got wet in the rain yesterday.
—Yes. I ________ football when it suddenly began to rain.
A．play B．am playing C．played D．was playing
38．I ________ when the wind ________ at around 11 pm last night.
A．fall asleep; was dying down B．fell sleepy; died down
C．felt asleep; died down D．fell asleep; was dying down
39．When Shenzhou XVIII was launched at 8:59 p. m on April 25th, I ________ for the bus at the bus stop.
A．waited B．have waited C．am waiting D．was waiting
40．The Greens ________ lunch when I arrived at their house yesterday.
A．was having B．were having C．are having D．is having
41．—Why didn’t you answer my phone yesterday, Rick
—Sorry. I ________ football with my friends when you called.
A．was playing B．played C．am playing D．play
42．_________ I got home, my mother was cooking _________ my father was watching TV.
A．When; while B．When; when
C．While; while D．While; when
43．—He seemed to be ________. Why
—When he _______ in his bedroom last night, a mouse ran across his body.
A．frightening; has slept B．frightened; was sleeping
C．frightened; is sleeping D．frightening; was sleeping
44．—What were your parents doing _________ you left home this morning
—My father was reading a book _________ my mother was washing clothes.
A．when; while B．while; when C．while; while
45．—What were you and Tom doing at this time yesterday
—I was playing the guitar ________ Tom was walking his dog.
A．when B．while C．until D．since
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外研版八年级上册Module8 when和while过去进行时专项练习
一、用所给词的正确形式填空
1．It (get) dark when we (arrive) at the village.
2．The children (swim) when they (hear) a big noise outside.
Later they knew that a huge tree (fall) down because of the strong wind at that time.
3．— the students (draw) when the teacher came in
—No , they .
4．Daniel (write) an e-mail to his friend when the doorbell rang.
5．When the lady (arrive), the man (lie) at the roadside unconscious.
She called the ambulance right away and waited till the medical team came for rescue.
6．While my friend and I (wait) at the gate, a stranger (hurry) to us for help.
7．—What made Ann’s mother so angry just now
—Ann (not listen) when her mom was trying to explain why they couldn’t go to the new theme park.
8．He (tie) a sheep to a tree when I saw him.
9．Tom said he （drive）home when suddenly the man rushed out.
10．While I (introduce) myself to the new class, Ms. Green’s sweet smile gave me much confidence.
二、按要求改写下列句子
11．When the accident happened, I was walking along the street. (就划线部分提问)
you when the accident happened
12．I was sleeping while Linda was helping her mother. (对划线部分提问)
you doing while Linda was helping her mother
13．Mario was taking a shower when Jimmy called him last night. (对划线部分提问)
was Mario when Jimmy called him last night
14．I was waiting for the bus when the rainstorm came. (改为否定句)
I waiting for the bus when the rainstorm came.
15．I was watching TV when Mother came in. (用while替换)
I was TV, Mother came in.
16．I was watching the birds when the rain started.（改写成一般疑问句）
you the birds when the rain started
17．I was walking in the street. I found a wallet on the ground. (合并为一句)
I was walking in the street I a wallet on the ground.
18．While we were walking on the road, it began to rain. (用when改写句子)
We were walking on the road began to rain.
19．I was singing at that moment when everybody came in. (改成一般疑问句)
you at that moment when everybody came in
20．While I was having a shower, you called me. （用when替换）
I a shower you called me.
三、单项选择
21．When I walked past the playground, Class 1 ________. But later, students told me that they lost ________ only 2 points.
A．had won; at B．were winning; by C．had won; by D．were winning; at
22．When the telephone rang I ________ cookies for my family.
A．make B．will make C．was making D．made
23．Jack ________ the meal for his family when someone knocked at the door.
A．cooks B．will cook C．is cooking D．was cooking
24．My wife and I ________ a horror movie when suddenly someone knocked at the door.
A．are watching B．were watching C．watched D．watch
25．While my mother ________ some shopping yesterday, she happened to meet an old friend.
A．was doing B．did C．has done D．does
26．I ________ about my sister when my phone rang. It was her!
A．am thinking B．thought C．will think D．was thinking
27．She ________ the rubbish when it began to snow.
A．throws B．is throwing C．will throw D．was throwing
28．I ________ a poster in my study when you called me.
A．make B．made C．am making D．was making
29．—Where is Peter
—I’m not sure. He ________ the piano in the music room when I saw him just now.
A．plays B．will play C．is playing D．was playing
30．What book ________ you ________ when you ________ me at four o’clock yesterday afternoon
A．did; read; was seeing B．did; read; saw
C．were; reading; saw D．were; reading; was seeing
31．—________ did the rainstorm come, Mr Liu
—While we ________ a chemistry lesson yesterday afternoon.
A．When; have B．When; were having
C．While; are having D．While; have
32．We ________ on Nanjing Road when it suddenly started to rain last Saturday.
A．walked B．were walking C．are walking D．was walking
33．While I ________ a short video in my room, my dog ran into the room.
A．recorded B．is recording C．was recording D．recording
34．—Yesterday afternoon, when I _______ a basketball match at the playground, I ______Peter!
—Really
A．was seeing; watched B．was watching; was seeing
C．watched; saw D．was watching; saw
35．My mother ________ while my father ________ a newspaper last night.
A．was cooking；read B．cooked；read
C．was cooking；was reading D．cooked；was reading
36．My mother ________ some washing when the telephone rang.
A．does B．was doing C．is doing D．did
37．—I heard you got wet in the rain yesterday.
—Yes. I ________ football when it suddenly began to rain.
A．play B．am playing C．played D．was playing
38．I ________ when the wind ________ at around 11 pm last night.
A．fall asleep; was dying down B．fell sleepy; died down
C．felt asleep; died down D．fell asleep; was dying down
39．When Shenzhou XVIII was launched at 8:59 p. m on April 25th, I ________ for the bus at the bus stop.
A．waited B．have waited C．am waiting D．was waiting
40．The Greens ________ lunch when I arrived at their house yesterday.
A．was having B．were having C．are having D．is having
41．—Why didn’t you answer my phone yesterday, Rick
—Sorry. I ________ football with my friends when you called.
A．was playing B．played C．am playing D．play
42．_________ I got home, my mother was cooking _________ my father was watching TV.
A．When; while B．When; when
C．While; while D．While; when
43．—He seemed to be ________. Why
—When he _______ in his bedroom last night, a mouse ran across his body.
A．frightening; has slept B．frightened; was sleeping
C．frightened; is sleeping D．frightening; was sleeping
44．—What were your parents doing _________ you left home this morning
—My father was reading a book _________ my mother was washing clothes.
A．when; while B．while; when C．while; while
45．—What were you and Tom doing at this time yesterday
—I was playing the guitar ________ Tom was walking his dog.
A．when B．while C．until D．since
参考答案：
1． was getting arrived
【详解】句意：我们到达村子时天已经黑了。根据“It…dark when we…at the village.”可知，句子结构为be doing sth…when…，表示一个动作发生时，另一个动作正在进行。第一空指的是天正在黑下来，时态应为过去进行时，其结构为：was/were doing，句子主语“It”为第三人称单数，助动词应为was，“get”的现在分词为“getting”；第二空指的是当我们到达村子的时候，句子时态为一般过去时，谓语动词应为其过去式。arrive“到达”，其过去式为“arrived”。故填was getting；arrived。
2． were swimming heard fell
【详解】句意：孩子们正在游泳，这时他们听到外面有很大的响声。后来他们知道，因为当时的强风，一棵大树倒下了。根据“The children ... (swim) when they ... (hear) a big noise outside.”可知，主句为过去进行时，“when”引导的从句是一般过去时，故第一空用过去进行时，且主语是“children”，需填were swimming；第二空用一般过去时，需填heard。第三空根据“they knew that”可知，时态为一般过去时，故第三空填过去式fell。故填were swimming；heard；fell。
3． Were drawing weren’t
【详解】句意：——老师进来时，学生们正在画画吗？——不，他们没有在画画。结合“when the teacher came in”可知，该句是过去进行时，其结构为“was/were+doing”，且该句是一般疑问句，而主语“the students”为复数名词，所以第一空要填“were”，首字母大写，而提示词“draw”的现在分词为“drawing”；根据回答语“No”可知，第三空要填“weren’t”。故填Were；drawing；weren’t。
4．was writing
【详解】句意：丹尼尔正在给他的朋友写电子邮件，这时门铃响了。根据“Daniel…an e-mail to his friend when the doorbell rang.”可知本句为when引导的时间状语从句，从句动作发生时，主句动作正在进行。由从句中rang可知，从句为一般过去时，则主句为过去进行时，主句主语Daniel为第三人称单数，be动词用was，即was writing。故填was writing。
5． arrived was lying
【详解】句意：当这位女士到达时，那个男人躺在路边不省人事。她马上叫了救护车，一直等到医疗队来救援。根据“When the lady ... (arrive), the man ... (lie) at the roadside unconscious.”可知when引导的时间状语从句，表示当某事发生的时候，另一件事正在进行，结合“called”可知此处从句用一般过去时，主句用过去完成时。arrive的过去式arrived；the man后用be动词was，lie的现在分词形式lying。故填arrived；was lying。
6． were waiting hurried
【详解】句意：当我和我的朋友在门口等着的时候，一个陌生人急忙向我们求助。这是while引导的时间状语从句，主句表示过去发生的事情，从句表示过去某个时刻正在发生的事情，所以从句用过去进行时，主语是复数形式，助动词用were，故填were waiting；hurried。
7．wasn’t listening
【详解】句意：——刚才是什么让安的妈妈这么生气？——当妈妈试图解释他们为什么不能去新的主题公园时，安没有在听。根据“when her mom was trying to explain why they couldn’t go to the new theme park”可知，主句表示在过去某一时间正在发生的动作，应用过去进行时，结构为“was/were+动词现在分词”，主语为第三人称单数，be动词用was，否定式在was后加not，缩写为wasn’t，故填wasn’t listening。
8．was tying
【详解】句意：当我看到他时，他正在把一只羊绑在树上。根据“when I saw him”在此处是when引导的时间状语从句，主句用过去进行时，从句为一般过去时。主语“He”为第三人称单数，谓语用was，tie的现在分词为tying。故填was tying。
9．was driving
【详解】句意：汤姆说他正开车回家，突然那个人冲了出来。drive“开车”，根据“when suddenly the man rushed out”可知当那个人冲出来的时候，他正在开车，用过去进行时was/were doing，主语是he，be动词用was。故填was driving。
10．was introducing
【详解】句意：当我正在给新班级做自我介绍的时候，格林女士的甜美微笑给了我很大的自信心。根据“While”可知句子表达过去时间点正在做某事，是过去进行时，主语是“I”，表达“介绍”动词用“was introducing”。故填was introducing。
11． What were doing
【详解】句意：事故发生时，我正沿街行走。划线部分表示“当时正在做的事情”，应用what对划线部分提问，位于句首首字母大写，主语为“you”，所以be动词应用were，位于疑问词后，主语后应用现在分词doing。故填What；were；doing。
12．What were
【详解】句意：我在睡觉，琳达在帮她妈妈。划线部分“was sleeping”表示正在做的事情，提问用what，句首首字母大写；特殊疑问句的主语为you，be动词要用were。故填What were。
13． What doing
【详解】句意：昨晚吉米给马里奥打电话时，他正在洗澡。就事件提问要用what“什么”，位于句首，首字母要大写，根据“was taking”可知，本句时态为过去进行时，动词应用现在分词形式doing。故填What；doing。
14． was not
【详解】句意：暴风雨来临时，我正在等公共汽车。原句是过去进行时，其结构为“was/were doing”，改为否定句在be动词后接not。故填was；not。
15． While watching
【详解】句意：妈妈进来的时候我正在看电视。此处可改为while引导的时间状语从句，从句用过去进行时，故第一个空填while，第二个空填watching。故填While；watching。
16． Were watching
【详解】句意：下雨的时候，我正在看鸟儿。句子为含有be动词的一般疑问句，且时态为过去进行时态，变一般疑问句时，be动词提前，主语为“you”，所以句首be动词为were；其后跟watching。故填Were；watching。
17． when found
【详解】句意：我走在街上。我在地上发现了一个钱包。原句是两个简单句，表示事情发生的时间前后，所以可以用when引导时间状语从句，即“当我在街上走的时候，在地上发现了一个钱包”，主句是过去进行时，从句时态是一般过去时。故填when；found。
18． when it
【详解】句意：当我们走在路上时，天开始下雨了。原句是while引导的时间状语从句，可换为when引导的时间状语从句，表示“当某事发生的时候，另一件事正在进行”，从句中用短暂性动作，it后用began。故填when；it。
19． Were singing
【详解】句意：当大家进来的时候，我正在唱歌。改为一般疑问句时，主语“I”要改为“you”，其前用be动词were，时态不变，you后用现在分词singing。句子开头首字母大写。故填Were；singing。
20． was having when
【详解】句意：我在洗澡时，你给我打电话了。when引导时间状语从句用一般过去时时，若主句动作为延续性动词，那么主句时态用过去进行时。故填was；having；when。
21．B
【详解】句意：当我走过操场时，一班赢了。但后来，学生们告诉我，他们只输了两分。
考查时态及介词。根据“When I walked past the playground”可知，第一空使用过去进行时表达过去某个时间段正在进行的动作，因此选“were winning”；lose by“以……输掉比赛：在比赛中以某个分数或差距输掉比赛”。故选B。
22．C
【详解】句意：当电话响起时，我正在为家人做饼干。
考查动词时态。根据句子结构可知，“When the telephone rang”是一个过去的时间点，表示电话响起的瞬间，而“我正在为家人做饼干”是一个正在进行的动作，因此需要用过去进行时态。故选C。
23．D
【详解】句意：当有人敲门时，杰克正在为他的家人做饭。
考查动词时态。根据“when someone knocked at the door.”可知，事情发生在过去，说的是有人敲门时，杰克正在做的事情，要用过去进行时。故选D。
24．B
【详解】句意：我和妻子正在看恐怖电影，突然有人敲门。
考查时态。根据“when suddenly someone knocked at the door.”可知，当有人敲门时，我和妻子正在看恐怖电影，句子用过去进行时，故选B。
25．A
【详解】句意：昨天当我的母亲正在购物的时候，她碰巧见到了一位老朋友。
考查动词的时态。此处是while引导的时间状语从句，强调母亲当时正在购物，这里应用过去进行时，故选A。
26．D
【详解】句意：我正在想我的妹妹，这时我的电话响了。是她！
考查时态。根据“I...about my sister when my phone rang.”可知，此处描述的是过去某一时刻正在发生的动作，应该用过去进行时，谓语动词构成是was/were+现在分词。故选D。
27．D
【详解】句意：她正在扔垃圾，这时开始下雪了。
考查时态。根据“when it began to snow”可知，句子描述过去的事情，句型为was/were doing sth...when...“正在做某事，这时……”。故选D。
28．D
【详解】句意：你打电话给我时，我正在书房里做海报。
考查动词的时态。根据“I…a poster in my study when you called me.”可知，主句表述过去某一时刻正在发生的事情，要用过去进行时，其构成为：was/were doing。故选D。
29．D
【详解】句意：——彼得在哪里？——我不确定。我刚才看见他的时候，他正在音乐室里弹钢琴。
考查过去进行时。本句是when引导的时间状语从句，从句是一般过去时，主句描述的是过去正在发生的事情，则应用过去进行时，其结构是：主语+was/were doing。故选D。
30．C
【详解】句意：昨天下午四点你看见我的时候你在读什么书？
考查动词时态。根据“at four o’clock yesterday afternoon ”可知，是描述过去某一时刻正发生的动作，主句用过去进行时，主语是you，结构用were doing；从句中see是短暂性动词，不用进行时，因此用一般过去时saw。故选C。
31．B
【详解】句意：——刘老师，暴风雨是什么时候来的？——昨天下午我们上化学课的时候。
考查特殊疑问词和动词的时态。when当，什么时候；while当。根据“While we … a chemistry lesson yesterday afternoon.”可知，问句提问的是暴风雨到来的时间，用特殊疑问词when，排除选项C和D；根据“while”和“yesterday afternoon”可知，第二空应该用过去进行时，结构为was/were doing。故选B。
32．B
【详解】句意：上周六，当我们在南京路上散步时，突然开始下雨。
考查动词的时态。根据题目时间状语“last Saturday”可知，这里表示过去的某个时间，又根据“when it suddenly started to rain”可知，表示一个动作在另一个动作发生时突然发生，通常用过去进行时来表示正在进行的动作。过去进行时的结构“was/were+动词的现在分词”。主语是We，所以be动词用were。故选B。
33．C
【详解】句意：当我正在屋里录短视频的时候，我的狗跑进来了。
考查时态。根据“While I ... a short video in my room, my dog ran into the room.”可知，从句动作是表示过去正在发生的动作，应用过去进行时“was/were+动词现在分词”，主语为I，be动词用was。故选C。
34．D
【详解】句意：——昨天下午，当我在操场上看篮球比赛时，我看到了彼得！——真的吗？
考查过去进行时和一般过去时。根据“Yesterday afternoon”可知，动作发生在过去。根据“when I...a basketball match at the playground”可知，此处是when引导的时间状语从句，空处表示在某一时刻正在进行的动作，应用过去进行时；第二个空表示在过去发生的动作，用一般过去时即可。故选D。
35．C
【详解】句意：昨晚我妈妈在做饭，而我爸爸在看报纸。
考查句子时态。根据句子结构，句子为while引导的时间状语从句，从句动作与主句动作同时发生且持续一段时间，第一、二空应用过去进行时，故选C。
36．B
【详解】句意：电话铃响的时候，我妈妈正在洗衣服。
考查过去进行时。根据“when the telephone rang”可知，空格处表示过去某一时刻正在发生的动作，应用过去进行时。故选B。
37．D
【详解】句意：——我听说你昨天被雨淋湿了。 ——是的。我正在踢足球，突然下起雨来。
考查过去进行时。根据时间状语从句“when it suddenly began to rain.”的语境可知，表示主句动作在过去某一时刻正在进行，应用过去进行时，其结构为：was/were doing；主语是第一人称单数形式，故助动词应用was；play的现在分词是playing。故选D。
38．D
【详解】句意：昨晚11点左右，风停了，我就睡着了。
考查动词短语和时态。fall asleep睡着；fall sleepy表达错误；feel asleep表达错误；die down逐渐消失。根据时间状语“ last night”可知，第一空用一般过去时；第二空根据“when”可知，此处是说昨晚大约在11点左右，大风逐渐消失的时候，用过去进行时。故选D。
39．D
【详解】句意：4月25日晚上8点59分，当神舟十八号发射升空时，我正在车站等车。
考查时态。根据“When Shenzhou XVIII was launched at 8:59 p. m on April 25th”可知此处表示8点59分时正在看新闻，用过去进行时was/were doing。故选D。
40．B
【详解】句意：昨天我去格林家的时候，他们一家人正在吃午餐。
考查动词的时态和主谓一致。根据“when I arrived at their house yesterday.”和句意可知，此处表达过去的某一时刻正在发生的动作，所以时态是过去进行时，主语是The Greens，此处强调家庭各个成员，所以结构为：were+现在分词，have的现在分词是having。故选B。
41．A
【详解】句意：——Rick，你昨天为什么不接我的电话？——对不起，你打电话的时候我在打篮球。
考查动词时态。was playing过去进行时；played一般过去时；am playing现在进行时；play一般现在时。根据“when you called”可知，此空须用过去进行时，表示一个动作发生的时候另一个动作正在进行。故选A。
42．A
【详解】句意：当我回到家时，妈妈在做饭，爸爸在看电视。
考查连词。while与when都表示“当……时”。while后用延续性动作，若主从句都用进行时，则表示动词同时进行；when后可用延续性动作或非延续性动作。根据“I got home”可知表示非延续性动作，则用when不用while；根据“my mother was cooking ... my father was watching TV.”可知，妈妈在做饭的时候，爸爸在看电视，表示两个动词同时进行，用while。故选A。
43．B
【详解】句意：——他似乎受到了惊吓。为什么？—昨晚他在卧室睡觉时，一只老鼠从他身上跑过。
考查形容词辨析和动词时态。frightening令人恐惧的；frightened感到恐惧的；has slept已经睡了，现在完成时；was sleeping正在睡觉，过去进行时；is sleeping正在睡觉，现在进行时。根据“He seemed to be…”可知此处指他感到恐惧，修饰人用形容词frightened；根据“a mouse ran across his body”可知时态是一般过去时，所以第二空处是when引导的时间状语从句，用过去进行时。故选B。
44．A
【详解】句意：——今天早上你离开家的时候，你父母在干什么？——我爸爸在看书，我妈妈在洗衣服。
考查连词辨析。when和while都引导时间状语从句，表示“当……时候”，区别在于when引导的从句，谓语动词既可以是延续性动词，也可以是短暂性动词，而while引导的从句，谓语动词必须是延续性动词。问句的主句是过去进行时，从句是一般过去时，且谓语动词left是短暂性动词，应用when引导；答语的主句是过去进行时，从句也是过去进行时，此时用while引导，强调两个动作同时进行。故选A。
45．B
【详解】句意：——昨天这个时候你和汤姆在干什么？——我在弹吉他，而汤姆在遛狗。
考查连词辨析。when当……时；while在……期间；until直到；since因为。根据“I was playing the guitar”及“Tom was walking his dog.”可知，此处主从句两个动作同时进行，用while引导时间状语从句。故选B
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